At times Bill was influenced by the suspense films of legendary director Alfred Hitchcock. Bill’s friend and fellow writer Arnold Drake claimed that Hitchcock may have likewise been influenced by comics including Bill’s. (I never said all of these would be long tales.)
Hitch cameo'd in many of his films. If only Finger cameo'd in some of his Batman stories...or even one. Well, he kind of did...in Detective Comics #80. The explanation will be in my book.